Creating a hop schedule for a short boil...

[TripleC223]

I'm putting the finishing touches on an American Wheat and would like some feedback on the hop schedule.

This will be a short boil (30 minutes) with the hops going in for only the final 20 minutes of that. I have never done such a short boil, or one without lengthy bittering additions, so what issues should I be mindful of? Is an IBU of ~21 too much for an American Wheat?

I have 4 oz of Huell Melon that I have been saving for this beer, and I would like to use a bit of Calypso to help bring out the fruitiness of that hop. I don't want a ton of bitterness from any of them.

Thank you, as usual, for any feedback.

Huell Melon American Wheat
Batch Size: 3 gallons
Boil Size: 3.25 gallons
Boil Length: 30 minutes
OG: 1.046
IBU: 21.27

Hop Schedule
20 min: 0.25 oz Calypso (12.8%)
5 min: 1 oz Huell Melon (6%)
0 min: 1 oz Huell Melon (6%)
Dry Hop (7 days): 1 oz Huell Melon (6%)
Dry Hop (7 days): 0.75 oz Calypso (12.8%)

Fermentables
3.3 lbs. Bavarian Wheat LME (Briess)
4 oz. table sugar
4 oz. Pale Ale DME (Briess)

Steeping Grains
3 oz. Munich 10L
1 oz. Melanoidin

Yeast
US-05